US5195478A - Piston for an internal combustion engine - Google Patents

Piston for an internal combustion engine Download PDF

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Publication number
US5195478A
US5195478A US07/766,379 US76637991A US5195478A US 5195478 A US5195478 A US 5195478A US 76637991 A US76637991 A US 76637991A US 5195478 A US5195478 A US 5195478A
Authority
US
United States
Prior art keywords
coated
coated portion
piston
sliding
skirt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/766,379
Other languages
English (en)
Inventor
Yasuhiro Kawabata
Soichi Hara
Hiroshi Kageyama
Toshiaki Konomi
Motoichi Murakami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd, Toyota Motor Corp filed Critical Aisin Seiki Co Ltd
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN SEIKI KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KONOMI, TOSHIAKI, MURAKAMI, MOTOICHI, HARA, SOICHI, KAGEYAMA, HIROSHI, KAWABATA, YASUHIRO
Application granted granted Critical
Publication of US5195478A publication Critical patent/US5195478A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49263—Piston making with assembly or composite article making by coating or cladding

Definitions

  • the present invention relates to a piston for an internal combustion engine.
  • a piston for an internal combustion engine has been proposed in Japanese Unexamined Patent Publication (KOKAI) No. 162014/1979.
  • the piston includes a resin coating which is provided on an entire sliding surface of a skirt portion thereof.
  • the piston includes slits which are formed in a resin coated surface.
  • the resin coated surface covers an entire sliding surface of a skirt portion of the piston, and the slits are adapted to be non resin coated portions in the resin coated surface.
  • the first conventional piston which includes the resin coating provided on the entire sliding surface of the skirt portion is effective in the reduction of the sliding resistance.
  • the resin is far inferior to aluminum, i.e., the mother material of the first conventional piston, in hardness and the thermal resistance, the resin coating loses the function of the sliding resistance reduction when it is worn out.
  • the resin coating is worn out because of the following reason. Namely, since the entire sliding surface of the skirt portion is coated with the resin coating, the piston comes to be operated without a lubricating oil. In other words, when the piston is operated, for instance, under a high temperature and high load condition, the mother material expands thermally so that there is no clearance between the piston and a cylinder bore. Accordingly, an oil film is more likely to break up. Thus, the resin coating is worn out rapidly when it is subjected to the above operating condition.
  • the second conventional piston includes the slits which are non resin coated portions in the resin coated surface. It is believed that the slits are formed by machining, etching, or the like. However, such a process for forming the slits requires a very time-consuming operation, and accordingly it results in an increased production cost.
  • a piston for an internal combustion engine which comprises:
  • skirt portion including a non-coated portion which is formed in an arbitrary shape on a sliding portion thereof and a coated portion which is formed on a sliding portion thereof other than the sliding portion on which the non-coated portion is formed.
  • a piston for an internal combustion engine which comprises:
  • a skirt portion including a non-coated portion and a coated portion, the non-coated portion formed on a sliding portion thereof and including a plurality of streaks which are formed in curves parallelly and independently of each other, which extend upward from a lower end portion of the skirt portion to a central portion thereof and which are disposed on both sides thereof when the skirt portion is viewed laterally, the coated portion formed on a sliding portion thereof other than the sliding portion on which the non-coated portion is formed.
  • the non-coated portion can be formed on a sliding portion of the skirt portion, and it can include a plurality of streaks which are formed in arcs parallelly and independently of each other and which extend downward from aN upper end portion and upward from a lower end portion of the skirt portion to a central portion thereof when the skirt portion is viewed laterally.
  • the non-coated portion and the coated portion can be formed by printing.
  • the coated portion can be formed of a resin.
  • the non-coated portion is formed in a groove shape, and that non-coated portion has a radial depth of 2 through 20 micrometers and the coated portion has a radial thickness of 2 through 20 micrometers.
  • the piston includes the coated portion and the non-coated portion which are formed on the skirt portion, and the piston thus constructed operates as follows.
  • an oil which has adhered on a cylinder bore is introduced into the non-coated portion which is depressed in a groove shape.
  • the sliding resistance can be reduced.
  • the coated portion is inhibited from wearing out, and its function of the sliding resistance reduction is maintained for a long period of time.
  • the non-coated portion does not work as a sliding surface, there arises a reduced sliding surface area which also results in the reduction of the sliding resistance.
  • the thus constructed piston according to the present invention draws the oil which has adhered on the cylinder bore into the non-coated portion, and it establishes the oil film in the non-coated portion. Accordingly, the sliding resistance can be reduced further by the synergetic advantageous effect than by the advantageous effects of the conventional pistons.
  • the synergetic effect is a combination of the advantageous effects of the coated portion and the oil film established in the non-coated portion. Namely, the lubricating oil is supplied to the sliding surface of the coated portion by the oil film established in the non-coated portion in a much greater amount than those supplied by the constructions of the conventional pistons.
  • the frictional force can be further reduced, the wear can be further suppressed, and the scuffing and the seizing can be further inhibited.
  • the coated portion is maintained for a long period of time.
  • the non-coated portion does not work as a sliding surface, there arises an additional sliding resistance reduction effect.
  • the sliding resistance of the piston according to the present invention is far less than that of a piston in which no coating is carried out on a sliding portion of the skirt portion, and it is less than that of the first conventional piston which includes the resin coating provided on the entire sliding surface of the skirt portion.
  • the non-coated portion can be formed on a sliding portion of the skirt portion so as to include a plurality of streaks which are formed in curves parallelly and independently of each other, which extend upward from a lower end portion of the skirt portion to a central portion thereof and which are disposed on both sides thereof when the skirt portion is viewed laterally, or the non-coated portion can be formed on a sliding portion of the skirt portion so as to include a plurality of streaks which are formed in arcs parallelly and independently each other and which extend downward from an upper end portion and upward from a lower end portion of the skirt portion to a central portion thereof when the skirt portion is viewed laterally.
  • the thus constructed non-coated portion establishes the oil film more reliably than the cases where the non-coated portion is formed only one of the right-hand side and left-hand side sections of the skirt portion or only one of the upper and lower sections thereof.
  • the coated portion and the non-coated portion can be formed by printing. Therefore, there occur no problems that the formation of the non-coated portion and the coated portion is as hard as the conventional process for forming the slits such as machining, etching, or the like, and that it leads to an increasing production cost.
  • the present invention provides another advantageous effect that the non-coated portion and the coated portion can be formed with ease and at a production cost as less as the case where the entire sliding surface of the skirt portion is coated with a resin.
  • FIG. 1 is a lateral view of a piston for an internal combustion engine of a First Preferred Embodiment according to the present invention
  • FIG. 2 is a cross sectional view of the piston taken along the line "I--I" of FIG. 1;
  • FIG. 3 is a lateral view of a piston for an internal combustion engine of a Second Preferred Embodiment according to the present invention.
  • FIG. 4 is a column chart for comparing the sliding resistances which are exhibited by a piston for an internal combustion engine according to the present invention, the first conventional piston therefor and a piston therefor which is free from any coating.
  • the piston 10 comprises a land portion 1 and a skirt portion 2.
  • the land portion 1 includes a top land 11, a second land 12, a ring-shaped groove 13 which is formed between the top land 11 and the second land 12, and a ring-shaped groove 14 which is formed between the second land 12 and an upper end shoulder 22 of the skirt portion 2.
  • the skirt portion 2 includes the upper end shoulder 22 and side cut-offs 23.
  • the side cut-offs 23 are non-sliding surfaces, and they are equipped with a pin (not shown).
  • Non-coated portions 21 are formed on a sliding surface of the skirt portion 2, and a resin coated portion 20 is formed on a sliding surface of the skirt portion 2 other than the sliding surface of the skirt portion 2 on which the non-coated portions 21 are formed.
  • the resin coated portion 20 is formed of a resinous raw material which comprises Teflon (a trade mark of a polytetrafluoroethylene polymer).
  • Teflon a trade mark of a polytetrafluoroethylene polymer.
  • the non-coated portions 21 include a plurality of streaks which are formed in curves parallelly and independently of each other. The streaks extend upward from a lower end portion of the skirt portion 2 to a central portion thereof, and they are disposed on both sides of the skirt portion 2 when the skirt portion 2 is viewed laterally.
  • identical resin coated portion 20 and non-coated portions 21 are formed on the opposite side of the skirt portion 2 of the piston 10, i.e., on the rear surface of the skirt portion 2 of FIG. 1.
  • the resin coated portion 20 has a radial thickness of approximately 10 micrometers.
  • the non-coated portions 21 are formed in a groove shape, and have a radial depth of approximately 10 micrometers.
  • the resin coated portion 20 can be replaced with a coated portion which is formed of a metal such as molybdenum, or the like.
  • non-coated portions 21 are formed as described above and as illustrated in FIG. 1 in the piston of the First Preferred Embodiment according to the present invention, they can be formed in independent dots, horizontal streaks which are disposed parallelly, or the like.
  • the non-coated portions 21 operate to establish the oil film effectively even when they are formed in any shape.
  • the formation of the resin coated portion 20 will be hereinafter described.
  • the resin coated portion 20 is formed by a general printing.
  • the portions to be made into the non-coated portions 21 can be covered with a film which is repellent to resins or which is hardly covered with resins in advance, and then the entire surface of the skirt portion can be covered with the resinous raw material.
  • the resin coated portion 20 and the non-coated portions 21 can be formed.
  • the portions to be made into the non-coated portions 21 can be covered with a masking stencil or screen in advance, and then the resinous raw material can be printed or coated through openings of the masking stencil or screen to form the resin coated portion 20.
  • the resin coated portion 20 can be formed by spray painting. However, it is hard to apply masking on the portions to be made into non-coated portions 21 having a complicated shape in the course of the spray painting, and consequently the spray painting results in an increased production cost.
  • an internal combustion engine employs the piston 10 of the First Preferred Embodiment according to the present invention which includes the resin coated portion 20 and the non-coated portions 21 formed on the skirt portion 2
  • an oil which has adhered on a cylinder bore of the internal combustion engine is introduced into the non-coated portions 21 which are depressed in a groove shape when the piston 10 is descending.
  • the construction of the piston 10 of the First Preferred Embodiment can supply the oil to the sliding surface in a much greater amount than the construction of the first conventional piston which includes the resin coating provided on the entire sliding surface of the skirt portion does.
  • the sliding resistance can be reduced by both of the resin coated portion 20 and the oil films established in the non-coated portions 21.
  • the piston 10 of the Second Preferred Embodiment has an identical construction with that of the piston 10 of the First Preferred Embodiment basically, but it has a resin coated portion 20 and non-coated portions 21 of different shapes.
  • the non-coated portions 21 include a plurality of streaks which are formed in arcs parallelly and independently of each other. The streaks extend downward from an upper end portion and upward from a lower end portion of the skirt portion 2 to a central portion thereof when the skirt portion 2 is viewed laterally.
  • the resin coated portion 20 is formed on a sliding surface of the skirt portion 2 other than the sliding surface of the skirt portion 2 on which the non-coated portions 21 are formed.
  • the resin coated portion 20 and the non-coated portions 21 are formed by printing, and various techniques can be employed in the course of the printing as set forth in the "First Preferred Embodiment" section.
  • identical resin coated portion 20 and non-coated portions 21 are formed on the rear surface of the skirt portion 2 of the piston 10 which is illustrated in FIG. 3.
  • the thus constructed piston 10 of the Second Preferred Embodiment according to the present invention operates and effects advantages in the same manner as that of the First Preferred Embodiment when it is employed in an internal combustion engine. Hence, the operation and advantageous effects of the piston 10 of the Second Preferred Embodiment will not be described herein.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US07/766,379 1990-09-27 1991-09-27 Piston for an internal combustion engine Expired - Lifetime US5195478A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2-101253[U] 1990-09-27
JP10125390 1990-09-27
JP3-050185[U] 1991-06-04
JP1991050185U JP2529001Y2 (ja) 1990-09-27 1991-06-04 内燃機関用ピストン

Publications (1)

Publication Number Publication Date
US5195478A true US5195478A (en) 1993-03-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US07/766,379 Expired - Lifetime US5195478A (en) 1990-09-27 1991-09-27 Piston for an internal combustion engine

Country Status (2)

Country Link
US (1) US5195478A (ja)
JP (1) JP2529001Y2 (ja)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476076A (en) * 1994-12-06 1995-12-19 Zhou; Zhishan Internal combustion piston engine utilizing interference movable fit technology
US5995093A (en) * 1996-12-06 1999-11-30 U.S. Philips Corporation Method and device for configuring a multimedia message for presentation
US6682778B1 (en) 2000-04-06 2004-01-27 Van Os Enterprises Stencil to pad method for applying a coating to a part
US20050087166A1 (en) * 2003-10-23 2005-04-28 Wolfgang Rein Piston having a patterned coating and method of applying same
US20060260583A1 (en) * 2005-05-18 2006-11-23 Hind Abi-Akar Engine with carbon deposit resistant component
WO2007073910A1 (en) * 2005-12-28 2007-07-05 Mahle International Gmbh Piston for an internal combustion engine
US20080271712A1 (en) * 2005-05-18 2008-11-06 Caterpillar Inc. Carbon deposit resistant component
US20090101442A1 (en) * 2004-12-14 2009-04-23 Makoto Katayama Hermetic compressor
US20100251886A1 (en) * 2009-04-01 2010-10-07 Fussner David W Method Of Fitting A Piston For Use In An Internal Combustion Engine
CN1782358B (zh) * 2004-12-02 2012-02-29 本田技研工业株式会社 用于内燃机的活塞
CN103748346A (zh) * 2011-08-09 2014-04-23 铃木株式会社 内燃机用活塞
DE102014219669A1 (de) 2014-09-29 2016-03-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung eines Kolbens
US20160312739A1 (en) * 2015-04-22 2016-10-27 Kubota Corporation Piston for engine
US20190063604A1 (en) * 2016-03-30 2019-02-28 Art Metal Mfg. Co., Ltd Piston for internal combustion engine
US11067032B2 (en) * 2019-12-24 2021-07-20 Toyota Jidosha Kabushiki Kaisha Piston

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009030521A (ja) * 2007-07-26 2009-02-12 Toyota Motor Corp ピストン
JP5267936B2 (ja) * 2009-01-05 2013-08-21 トヨタ自動車株式会社 内燃機関のピストン
JP6587978B2 (ja) * 2016-06-01 2019-10-09 株式会社クボタ エンジンのピストン
JP6796956B2 (ja) * 2016-06-15 2020-12-09 アート金属工業株式会社 内燃機関用ピストン

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197942A (en) * 1937-07-05 1940-04-23 Over Claude Stanley Piston or plunger for engines, pumps, and the like
US2806751A (en) * 1954-12-03 1957-09-17 Bell & Gossett Co Piston
US2817562A (en) * 1953-07-01 1957-12-24 Gen Motors Corp Coated piston
US3995538A (en) * 1975-05-30 1976-12-07 General Motors Corporation Crosshead piston assembly
JPS54162014A (en) * 1978-06-12 1979-12-22 Mazda Motor Corp Piston for internal combustion engine
US4395442A (en) * 1980-12-19 1983-07-26 Wabco Fahrzeugbremsen Gmbh Method of coating the working surfaces of piston operating devices
JPS6065360A (ja) * 1983-09-20 1985-04-15 Nec Corp メモリ自已診断方式
US4519119A (en) * 1980-11-19 1985-05-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of manufacturing a piston for a swash plate type compressor
JPS63110766A (ja) * 1986-10-29 1988-05-16 Nec Corp テスト信号発生回路
JPH02117072A (ja) * 1988-10-26 1990-05-01 Toyo Eng Corp 燃料電池発電システム
JPH02126058A (ja) * 1988-11-05 1990-05-15 Yanmar Diesel Engine Co Ltd ヒートポンプ装置の運転制御方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197942A (en) * 1937-07-05 1940-04-23 Over Claude Stanley Piston or plunger for engines, pumps, and the like
US2817562A (en) * 1953-07-01 1957-12-24 Gen Motors Corp Coated piston
US2806751A (en) * 1954-12-03 1957-09-17 Bell & Gossett Co Piston
US3995538A (en) * 1975-05-30 1976-12-07 General Motors Corporation Crosshead piston assembly
JPS54162014A (en) * 1978-06-12 1979-12-22 Mazda Motor Corp Piston for internal combustion engine
US4519119A (en) * 1980-11-19 1985-05-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of manufacturing a piston for a swash plate type compressor
US4395442A (en) * 1980-12-19 1983-07-26 Wabco Fahrzeugbremsen Gmbh Method of coating the working surfaces of piston operating devices
JPS6065360A (ja) * 1983-09-20 1985-04-15 Nec Corp メモリ自已診断方式
JPS63110766A (ja) * 1986-10-29 1988-05-16 Nec Corp テスト信号発生回路
JPH02117072A (ja) * 1988-10-26 1990-05-01 Toyo Eng Corp 燃料電池発電システム
JPH02126058A (ja) * 1988-11-05 1990-05-15 Yanmar Diesel Engine Co Ltd ヒートポンプ装置の運転制御方法

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476076A (en) * 1994-12-06 1995-12-19 Zhou; Zhishan Internal combustion piston engine utilizing interference movable fit technology
US5995093A (en) * 1996-12-06 1999-11-30 U.S. Philips Corporation Method and device for configuring a multimedia message for presentation
US6682778B1 (en) 2000-04-06 2004-01-27 Van Os Enterprises Stencil to pad method for applying a coating to a part
US20050087166A1 (en) * 2003-10-23 2005-04-28 Wolfgang Rein Piston having a patterned coating and method of applying same
US7171936B2 (en) 2003-10-23 2007-02-06 Mahle Technology, Inc. Piston having a patterned coating and method of applying same
CN1782358B (zh) * 2004-12-02 2012-02-29 本田技研工业株式会社 用于内燃机的活塞
US20090101442A1 (en) * 2004-12-14 2009-04-23 Makoto Katayama Hermetic compressor
US8210832B2 (en) * 2004-12-14 2012-07-03 Panasonic Corporation Hermetic compressor
US20060260583A1 (en) * 2005-05-18 2006-11-23 Hind Abi-Akar Engine with carbon deposit resistant component
US7383806B2 (en) 2005-05-18 2008-06-10 Caterpillar Inc. Engine with carbon deposit resistant component
US20080271712A1 (en) * 2005-05-18 2008-11-06 Caterpillar Inc. Carbon deposit resistant component
WO2007073910A1 (en) * 2005-12-28 2007-07-05 Mahle International Gmbh Piston for an internal combustion engine
US8408116B2 (en) 2009-04-01 2013-04-02 Delaware Capital Formation, Inc. Method of fitting a piston for use in an internal combustion engine
US20100251886A1 (en) * 2009-04-01 2010-10-07 Fussner David W Method Of Fitting A Piston For Use In An Internal Combustion Engine
CN103748346B (zh) * 2011-08-09 2016-12-28 铃木株式会社 内燃机用活塞
CN103748346A (zh) * 2011-08-09 2014-04-23 铃木株式会社 内燃机用活塞
US20140158081A1 (en) * 2011-08-09 2014-06-12 Suzuki Motor Corporation Piston for internal combustion engine
US9086030B2 (en) * 2011-08-09 2015-07-21 Suzuki Motor Corporation Piston for internal combustion engine
DE102014219669A1 (de) 2014-09-29 2016-03-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor und Verfahren zur Herstellung eines Kolbens
US20160312739A1 (en) * 2015-04-22 2016-10-27 Kubota Corporation Piston for engine
CN106065826A (zh) * 2015-04-22 2016-11-02 株式会社久保田 发动机的活塞
US10018147B2 (en) * 2015-04-22 2018-07-10 Kubota Corporation Piston for engine
CN106065826B (zh) * 2015-04-22 2020-04-03 株式会社久保田 发动机的活塞
US20190063604A1 (en) * 2016-03-30 2019-02-28 Art Metal Mfg. Co., Ltd Piston for internal combustion engine
US11111877B2 (en) * 2016-03-30 2021-09-07 Art Metal Mfg. Co., Ltd. Piston for internal combustion engine
US11067032B2 (en) * 2019-12-24 2021-07-20 Toyota Jidosha Kabushiki Kaisha Piston

Also Published As

Publication number Publication date
JP2529001Y2 (ja) 1997-03-12
JPH0488750U (ja) 1992-07-31

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